CVE-2026-52843

CRITICAL9.3

Lightpanda: fetch() and XMLHttpRequest attach session cookies to cross-origin requests regardless of credentials mode

Published Jul 15, 2026

Modified 1 months ago

Details

Lightpanda is a headless browser designed for AI and automation. Prior to 0.2.9, Lightpanda fetch() and XMLHttpRequest unconditionally attached session cookies to every HTTP request, ignoring credentials: omit, credentials: same-origin, credentials: include, and XMLHttpRequest.withCredentials, allowing an attacker-controlled origin in a Lightpanda session to issue authenticated cross-origin requests against a victim origin. This issue is fixed in version 0.2.9.

References

WEB

https://github.com/lightpanda-io/browser/commit/2cdaac780bed65db98bbb6ed2ad5bc6011863c76

WEB

https://github.com/lightpanda-io/browser/pull/2155

WEB

https://github.com/lightpanda-io/browser/releases/tag/0.2.9

WEB

https://github.com/lightpanda-io/browser/security/advisories/GHSA-36mm-v3c2-24cc

ADVISORY

https://www.cve.org/CVERecord?id=CVE-2026-52843

CVSS Analysis